<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false">
      </el-alert>

      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave"
        @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="">
                    <el-cascader
                    v-model="addForm.goods_cat"
                    :options="cateList"
                    :props="{ ...cateProps }"
                    @change="handleChange">
                    </el-cascader>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
                <!-- 渲染表单的item项 -->
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <!-- 复选框组 -->
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
                    </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                    <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
                <!-- action是图片要上传到后台的API地址 -->
                <el-upload
                :action="uploadUrl"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headersObj"
                :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
                </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器组件 -->
                <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                <!-- 添加商品的按钮 -->
                <el-button type="primary" class="btnAdd"
                @click="add">添加商品</el-button>
            </el-tab-pane>
        </el-tabs>
     </el-form>  
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
    title="图片预览"
    :visible.sync="perviewVisible"
    width="50%">
    <img :src="previewPath" alt="" class="perviewImg">
    </el-dialog>
  </div>
</template>

<script>
export default {
    data() {
        return {
            // 步骤完成进度
            activeIndex: '0',
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组 
                goods_cat:[],
                // 图片的数组
                pics:[],
                // 商品的详情描述
                goods_introduce:'',
                attrs: []
            },
            addFormRules: {
                goods_name: [
                    { required: true , message: '请输入商品名称' , trigger: 'blur' } 
                ],
                goods_price: [
                    { required: true , message: '请输入商品价格' , trigger: 'blur' }
                ],
                goods_weight: [
                    { required: true , message: '请输入商品重量' , trigger: 'blur' }
                ],
                goods_number: [
                    { required: true , message: '请输入商品数量' , trigger: 'blur' }
                ]
            },
            // 商品分类列表
            cateList: [],
            // 级联选择器的配置对象
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 动态参数列表数据
            manyTableData: [],
            // 动态属性列表数据
            onlyTableData: [],
            // 上传图片的Url地址
            uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件headers请求头对象
            headersObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            // 图片的路径
            previewPath:'',
            // 控制图片预览窗口的显示与隐藏
            perviewVisible: false,
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类数据
        async getCateList() {
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200) return this.$message.error('获取商品失败')

            this.cateList = res.data
            // console.log(this.cateList);
        },
        // 级联选择器选择项变化就会触发这个函数
        handleChange() {
            console.log(this.addForm.goods_cat);
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        // 在离开第一个标签页之前
        beforeTabLeave(activeName,oldActiveName) {
            // console.log('即将离开标签页的name' + oldActiveName);
            // console.log('即将进入标签页的name' + activeName);
            // return false
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择分类')
                return false
            }
        },
        // tab标签被点击时
        async tabClicked() {
            // console.log(this.activeIndex);
            // 证明访问的是动态参数面板
            if(this.activeIndex === '1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel: 'many'}})
                if(res.meta.status !== 200) return this.$message.error('获取动态数据失败')
                console.log(res.data);

                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : 
                    item.attr_vals.split(',')
                })
                this.manyTableData = res.data
            }
            else if(this.activeIndex === '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel: 'only'}})
                if(res.meta.status !== 200) return this.$message.error('获取静态数据失败')
                console.log(res.data)

                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            this.previewPath = file.response.data.url
            this.perviewVisible = true     
        },
        // 处理移除图片的操作
        handleRemove(file) {
            console.log(file);
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3.调用数组中的spilce方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm); 
        },
        // 监听图片上传成功的事件
        handleSuccess(response) {
            console.log(response);
            // 1.拼接得到一个图片信息对象
            const picInfo = {pic:response.data.tmp_path}
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        // 添加商品
        async add() {
            this.$refs.addFormRef.validate(valid => {
                if(!valid) return this.$message.error('请填写必要的表单项目')
            })

            // 执行添加的业务逻辑
            // lodash cloneDeep(obj)
            const form = JSON.parse(JSON.stringify(this.addForm))
            form.goods_cat = form.goods_cat.join(',')

            // 处理动态参数
            this.manyTableData.forEach(item => {
                const newInfo = {
                    attr_id: item.attr_id,
                    attr_value: item.attr_vals
                }
                this.addForm.attrs.push(newInfo)
            })
            // 处理静态属性
            this.onlyTableData.forEach(item => {
                const newInfo = {
                    attr_id: item.attr_id,
                    attr_value: item.attr_vals
                }
                this.addForm.attrs.push(newInfo)
            })

            form.attrs = this.addForm.attrs
            console.log(form);

            // 发起请求添加商品
            // 商品的名称必须是唯一的
            const {data:res} = await this.$http.post('goods',form)
            if(res.meta.status !== 201) return this.$message.error('添加商品失败！')
            this.$message.success('添加商品成功！')

            this.$router.push('/goods')

        }
    },
    computed:{
        // 获取三级分类的id
        cateId() {
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }

}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin:0 10px 0 0 !important;
}
.perviewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>